Rebecca's smoking gets her into big trouble when she accidentally starts a fire in the bar, and blames it on faulty wiring.

Carla is forced to clean up her act and behave nicely when she's forced to find another job while Cheers is being rebuilt. Woody's faith in Kelly is shaken when he learns they have religious differences.

Norm's new job seems like a dream come true when he becomes a beer taster at a brewery. Rebecca finds she can't tear herself away from the bar's new slot machine.

Henrí challenges Sam to a contest to see who's the bigger ladies' man. Rebecca resorts to desperate measures in her quest to quit smoking.

Maggie returns to Cheers and Cliffie, this time claiming she's carrying his baby. Rebecca hires a hack songwriter to create a jingle for the bar.

Rebecca spots Lilith with another man, and doesn't know whether to tell Frasier. Later, Lilith confesses to Frasier that she cheated on him - once. Frasier is devastated, and after he and Lilith talk about it, Frasier asks Lilith to tell her lover the affair is over. Lilith goes to see him - and then comes back saying she wants to leave Frasier. Meanwhile Sam hires a bouncer named Tiny, but can't bring himself to fire Tiny when nobody wants to go near him.

Lilith informs Frasier that she wants to spend a year away from him, sealed in a biosphere with her lover. Frasier reacts to this like any trained psychiatrist - he steps onto the ledge of Melville's and threatens to jump if Lilith leaves him. Lilith and Sam manage to talk him down, but Lilith insists their marriage is over. Once Lilith has gone, Frasier's friends rally round in support of him.

Kelly's father is convinced that Woody has blackmail on his mind when Woody sees Mr. Gaines cheating on his wife. Rebecca plans to hold a Thanksgiving dinner at the bar.

Carla tries to hide her feelings when John Hill has a heart attack. Cliff believes that Hitler has moved into his building.

Rebecca's father attempts to make her return with him to San Diego while Woody tries to exert his will over Kelly, to make her move her things to his apartment.

Sam gets cold feet about selling his beloved car, and goes so far as to romance the buyer's widow to get it back. Rebecca befriends a pig destined to be Woody's Christmas dinner.

Frasier decides to start dating other women now that Lilith has left him and Frederick, and makes a date with his secretary, Shauna. He arrives at Shauna's house only to discover that Shauna is just using him to annoy her parents as they are not letting her see her boyfriend - who then turns up unannounced. Meanwhile, Cheers is hosting a family reunion, and Cliff and Norm are videotaping it, but then discover the camera was never switched on and have to try and recreate the video without anyone realising.

Norm can avoid an audit, if he'll just sleep with his investigating IRS agent. Sam is very reluctant to let the gang watch a videotape of one of his old games.

Robin turns up with bad news and good news. The bad news is he's broke, flat, busted. The good news is he's remembered that a money belt stuffed with cash is hidden in the bar somewhere.

Carla's daughter insists on having her father walk her down the aisle, despite Carla's objections.

Frasier is upset when he hears that Lilith now officially want s a divorce. The staff at Cheers decide to hold a ""happy divorce"" party to cheer him up, and at the party, whilst Woody drinks too much and becomes a mean drunk, Frasier gets drunk. Afterwards Rebecca drives him home, but they end up in bed together. However, first the gang pop around to check Frasier is OK - and to watch ""The 3 Stooges"" - but just when they leave, who should show up but Lilith, who has escaped from the eco-pod...

After returning to Boston only to discover Frasier in bed with Rebecca, Lilith comes to Cheers to seek Sam's advice. Frasier comes after her, and Rebecca shows up as well to explain. Frasier says he can't take Lilith back after what she did - just as her lover, Dr Pascal, shows up and takes the gang as hostages unless Lilith returns to him. When Paul and John Allen Hill show up and also get taken as hostages, Lilith has to persuade Pascal to let them all go, and that she doesn't want to go back. Plus will she reconcille with Frasier?

Sam puts the bar's former owner in charge while he and the guys go to a drive-in theater.

Sam enlists Harry the Hat to help win the latest war of practical jokes between Cheers and Gary's Old Towne Tavern.

Sam locks his keys in the bar, meaning he can't go home. He goes to Carla's to get her keys to the bar, but Woody has them. Carla offers Sam her couch for the night, but John Allen Hill is there so Sam heads off. He visits the houses of Cliff, Norm and Frasier before finally ending up in Rebecca's house.

Frasier decides to conduct an experiment in voter psychology by getting Woody on the ballot for city council.

A night of drinking leads to some surprises and revelations when Carla tells Sam that she drunkenly slept with one of the regulars that night - but can't remember who! Could it be Norm, or Cliff, or Frasier, or what about the most unlikely person in the bar she could have slept with - Paul.....?

After Woody, Kelly and her father Lloyd arrive at Cheers talking about classical music (they'd been to a symphony), Rebecca joins in the conversation and impresses Lloyd. He invites her to a society function. Rebecca thinks it is a date and is thrilled to bits - but is in for a shock when she arrives. Meanwhile Esther Clavin has been put in a retirement home by Cliff, but whilst Cliff feels guilty, the others think he has murdered his mother.

After Woody, Kelly and her father Lloyd arrive at Cheers talking about classical music (they'd been to a symphony), Rebecca joins in the conversation and impresses Lloyd. He invites her to a society function. Rebecca thinks it is a date and is thrilled to bits - but is in for a shock when she arrives. Meanwhile Esther Clavin has been put in a retirement home by Cliff, but whilst Cliff feels guilty, the others think he has murdered his mother.

Rebecca finds herself really attracted to a handsome plumber. Sam joins a help group for sexual compulsives.

Whilst watching the National Cable Ace Awards, the gang sees ex-waitress Diane Chambers winning the award for best writing in a mini-series. This leads to Sam calling Diane to congratulate her, and to find out that she is married and has children. Sam tells her Diane that he too has a wife and kids, and invites Diane and her husband to visit them. Sam strongly believes Diane is lying and becomes really shocked when she walks into Cheers the following day to meet Mrs Malone. Meanwhile Rebecca's boyfriend Don proposes to her and she accidently says no, ends up heartbroken and agrees to play Sam's wife to fool Diane. Sam and Rebecca have dinner with Diane and her husband, Reed Manchester. During the dinner Don arrives and proposes to her again, and this time she manages to say yes! They leave the dinner, and Sam thinks he must look like a fool. Then Diane's husband turns out to be a fake when *his* husband Kevin appears! Now alone, Sam and Diane reminisce about the good old times, and end